potency of phosphoric acid

my wife has been suffering from hypothyroidism for the past five years. many homeopaths tried many homeopathics like sulph, calc carb, lyco, nat mur, sepia, arg nit, anacardium, nux vom, bryonia, thyroidinum and the like. she did not respond to many of them, but responded partially to some. right now, she has the following symptoms:
physical weakness, lack of energy, sleepiness, impaired memory, headache mainly leftsided, occasional vertigo, low sexual desire and abdominal gas. most of her symptoms come or aggravate after sexual relationship and she feels very tired after sex. she is relieved slightly after sleep especially in headache. heat of sun generally cause headache.
ion the basis of these symptoms i would like to give her phosphoric acid. but i am confused about its potency and dose. which potency of acid phos should i give her?and how many doses? she has not taken acid phos so far. please help me, friends.
regards,
thahir.